What was Paul's thorn in the flesh?

Question: "What was Paul's thorn in the flesh?"

Answer: So that Paul would not forget, God allowed him to be inflicted with a constant reminder of his weakness. Countless explanations concerning the nature of his thorn in the flesh have been offered. They range from incessant temptation, dogged opponents, chronic maladies (such as eye problems (Galatians 4:15), malaria, migraine headaches, and epilepsy), to a disability in speech. No one can say for sure what his was, but it probably was a physical affliction (for the work of Satan in this, cf. 1 Corinthians 5:5; 10:10).

It is understandable that Paul would consider this thorn a hindrance to wider or more effective ministry (Galatians 5:14-16) and that he would repeatedly petition God for its removal (2 Corinthians 12:8). But he learned from this experience the lesson that dominates this letter: divine power is best displayed against the backdrop of human weakness (2 Corinthians 4:7) so that God alone is praised (2 Corinthians 10:17). Rather than removing the problem God gave him grace and strength in it and through it.